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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5a56985ac5a603c5f8f8994f7e8d22360193e847bdac7756d039f735351b61' 
  AND token = '84IMnRWrdA11VXi1Z5prosg2pM0htPJfCLH5nfnx7cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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