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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80937b1e18b32626871b08826a808f5f60367726e29f7d10825155c68ff9eaaf' 
  AND token = 'akWvxZUw9CSKw8IK9oXLpVGXVNmO0Fa96H8vTqRGfrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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