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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45955cd613f97387193ffb4d3a962b8bb417e074c079c7d3f55605bab2201461' 
  AND token = 'IxLVtU9+kvhy5HdQ28WFOg4Mr0LwX/6FvskskA2cBbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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