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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc48511496f0bea59f9cf3a18840a4835221b46c6b839804b2670a24701f00b6' 
  AND token = 'SVh7Y3uPdxIx82xoQR+JjgD0P6GeyLYaneIekng9qlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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