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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57dc897ff75e97d3367416936d1e1c45784619e8014a07253acf34e58c65403' 
  AND token = 'epaKUgz7jpXmtOgYFBVncRcVn3fjVgf4KnTJ9CqIXEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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