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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3803a972cc775ce39a12414e555b12dfbf7821a953de62927486a5ede3c5231a' 
  AND token = '4Fk9JFcmfftqCzXmN1DvH4h7pRp5/FkrVBy4eoRcWAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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