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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba09ab3f9bc40e461983bf453b1e03ec461cdabf61f3f4206cfd8fa48b2937e' 
  AND token = 'NZT8gK0WJDvYPHN54Z4YXf0C2vJ/fg34U++11eFnzX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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