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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e47dd8aa4d742e21c63690382eae4071404b6018c26f074616fd271ef34797' 
  AND token = 'zL5jVSk7UqfiyxrKAhevJ8k6jRMHD5IINnnAvnudCf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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