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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09c565c8dfa292371b203cacb938609a6613392160695bd87d10f9e36d5df5f' 
  AND token = 'Z/p3TL04lTjdHkw+QRU3eskE8hWQVGMEjd0vFt+oHhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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