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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b371fca5fbf4779bfb7ad72699a9efb0056b8fd4cfbb7a27357033e6f5840a' 
  AND token = 'VRemfN6GPujXi7xib/CD+4FlUzvDoSUWc3MsOrtmjXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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