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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686098dd2fefea458eb03086d92d5fc2cd88c0b2c865094c4beaca7e11fc3734' 
  AND token = 'qIcPjXE/h8tfuhNTIeZT7896sd7z5mfSk6UJoYD1aU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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