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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57f52ec50732a2d872743ec12e6b575001bde6ca25bd68e70d5a999bd4cbf87' 
  AND token = 'LN9iUw8/gBggJl4uddVjyvlk2C/Olsy8+03R5fRBHZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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