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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e53e43f1df3caaaf80bd9d31a17fb4af0cc093ce58880980b8d9cc46aa57d4e' 
  AND token = 'iXtSPvZydQHw/Eh9lm0r0H/2TrJf4/6AJdyOTwJLUc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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