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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ec4b4754573eaed1f44a009e13df3ffdd45f65ec43a83464e5ad0b6ae0805a' 
  AND token = 'Y2extfhiyqPd1uX+KW0Xa8h9yo/e+RDjygTwxg89D4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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