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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d16fc48a665d5a2cc796f74e7ec0b984a5568d702d051db2576729557219dc2' 
  AND token = 'Hh2DVOaKcx6MhrClNZ/2Hq8UW/Sd9LlFAaNvNZvFRCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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