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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f8e65e789cd43a7e06e569c06487f3d00ccfc7e9a7718ebb75e4df63ba3f6c' 
  AND token = '8albGOhEZuwrkKNCITaY1RKJ9WDZYWu4ZjM5SQTSv04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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