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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7618473a2f3df253d5a0e466335a24f751655d74f8f8ad565fa16dd22f9de0e8' 
  AND token = 'CiA6TLpmUa0gaFdwecr9AfYmSoL16Ool0m8nvGF0lu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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