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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e57d040773afc2620933d7ec2a28568923dad0b555d64686d08814e43c5dd8' 
  AND token = 'okEB07paA31kI9iH3+hCf7u9byjD2IzUQqaCZLdJmCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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