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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee93856a383cf4bb87adb5a9e23231cd20cb374a68a139d0ba024af138e678a8' 
  AND token = 'H89jncz2mVs+KSm7LKu4Yv72Q/fgLTPRAAWdV4OKMZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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