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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c891129e101e869729033b2d2965189ab6af5bdb36bdd3cd6da573a37facf2fa' 
  AND token = '+Y8gzMcmJXkIeyR6IZuMj3hujp/J2+GMtbSleJDu09c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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