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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5be07cdeeb982168f58b7c1e3eeeed449f49feb782181f2998f4ceca5b956d' 
  AND token = 'WJE4bAcupPpJN5R/jHEu8kJ+3a/zj5axCmtB2FlW30g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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