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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27907ded8f389da6e2b63c5e3b3570799162fe52d9114c1969c5cb168b7d480' 
  AND token = 'YYoG/0DzyzcCWJ9zZiCZEuSEAYHnpp1sfr5Y1vXC9J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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