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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c9950f4f7814716dd223a408716cccace52447e1123a2c69ae53d9436a279e' 
  AND token = 'AJBlIixK8Rq7xexhdBs2ZQp2rWIfS4TOp/2gEq+G1h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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