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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d5c10907c615043e0e4051fc7a37a20747fc04fc16f4fb68c956cc7138f5e8' 
  AND token = 'XiI4ACliD71HTVUhCgtsC+CO/RV82jMUpWwiAzUBDbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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