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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4834e57f12abaa068e39abbb5c086dca5baad538998c4a5665244231f40d4800' 
  AND token = 'DNAww6bJRMDOhnXFGV5ld8xydYr90hngfC2wsf4Ywro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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