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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0e962e9119b04baa3995e55e3a6f2c682a64c56251ec2f52f1d8a5f1172437' 
  AND token = 'gBrozOoz4IT//ZNRBQ0p500ksTlR+yn/QiyLICib96s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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