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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633e442548a72c7926c19f76905a574c787300f0057a6a32ffe6f1481b85ff55' 
  AND token = 'ihtsiSJZnJg3qPRnI0VpmH2az9EfRU0wC88PMIAT378=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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