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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1d4d015a953c332b4d2e7f6a2a04f1ec4f63f19f1259fc4036ec5ba122ec54' 
  AND token = 'sv/UfQ8UpjQ93MiI/uE3kZCJIQDXYmKReLzwLcRkGP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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