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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19907be9b3916e610148622603288b565993bf3b198ade5be2a84b2c01792c3c' 
  AND token = 'eG21ey87wGBfxJB88Sogq3QeSsFqhBMkYotvfsXv3KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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