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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6014fac00dc915d41ac16db7705454545a95507e2f8f15dfdce8b867b5aef76' 
  AND token = 'cL1Auw9mAE9LZtw7K2ceRCmM8Be1yeYlcZkCf8ASF8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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