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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9358f4ccf7f9b97bd513f2430f5df8e06f2bd244651f1f1fc36dd214d68dc358' 
  AND token = 'PONrx4OgsnAnlaaOPqeMVnWNde190kI/8y3BLhalie0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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