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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2ff005dcb4dd99b3d04bc0c99f4a2aa73bb0544b0b869ce34ca91fb1824a4a' 
  AND token = 'QiSBSofu29C5c7RahOJg6T2eyJ5T83XPBIRkfHswR8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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