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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6932b8181d6f6f888781af09e807a0ac56da25f0544959987b9ba497698d2a7f' 
  AND token = 'WVSVMZQE2CL1ZG6HZkbkdJu5RMYwugbTfOcwOZtkRbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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