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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1975bf10a8c71e599bc652d0db7304f671217efa194406b49ef5ad8556b650d9' 
  AND token = 'wQZeo0KHkdyWyeeIXsO7ImcPlFvXEM84Qc/1KNJOQEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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