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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142a51788d42e4451e4cb2a1a0cc3c296ca5866f03f47f81c3e84a1561e0e2ed' 
  AND token = 'rT3FMn9pJ4Xr33v9T/a9AZ73DrjzWhNIVgkFejkTQw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}