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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce61c2470a85e4357a28ee530e3b77bdb54ad13ca2ab4810894ada24422622c9' 
  AND token = 'epkUe2uoTXjKubuNxS3Wk/VKeXY1yGt/n/x9dR5BJho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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