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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fee6ce4ad61938cd9a9cff9cfde6253fd0f33f17a10cd243c5ebc63ec25af9c' 
  AND token = '5ZUfcFRPlu6VICQZI0IxSBA5Y2ZFrKsR/X//7+72v8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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