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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c90662dbdb63d9593d7791b6fae3edd9894daacd76c90feb1d0c3e6612410f' 
  AND token = 'UmLy8sAaCFaoFn+YhpcGHDDutYlBhv1M9u93MLn53sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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