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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a278da501901f0ffcd95eea2597a266ec878046bedd6998e0bd59e38047c99' 
  AND token = 'RtDOwMm0mnBZvY5vrjMWjpfTYtoMeF63/WnTuhTJCsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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