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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c840fff1d3d50673aed65e8fef58201e1e13426503198fc561c001926f8266' 
  AND token = 'HqdHgBgFq9L3a86Gna52z5mTtPVJVkEcqUL3ENkEojY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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