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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd711247254b1cb776a7308b55895d263373871dd4b3266f0756b898103244129' 
  AND token = '6GAaGAX8IFmuK9TkI1c5OXszQNWz0zi0CLjmhsfBO4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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