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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b218fbdf61c650bdcbc7ce5a09db02aeaef29e5bc4d2d03a2990ff746891470f' 
  AND token = '9mQNI7heB/WAyFVYmO9bnUkkCUZCyBkXK9l8M+KDRTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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