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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa22d8c2859e2c760f89990cbd464c54e9ebb380b662367629818355a5e15ed3' 
  AND token = 'iN5jgPfsyc8MIW4iN0vhSvyE5BO7S40vL9nV5D5PCfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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