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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ec6dd2f6cd04aa5bbda37117ba4d553e979d4ccb2d33972367bdebb330dae6' 
  AND token = 'xdBMwecC1VZDReJ6JxbVBn8kGoVDgPe+B192lmemP0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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