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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8b62abd822850b1040e4d0f0b4ee444416b7cbaf2ff7c15ff019205b62b2d3' 
  AND token = '6Wg6nabnfuY97ocR8QK5yYy88HMKgxX5DMJYeD/2AJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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