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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18695975274f09ecd52e0e22de7f1a3ad30ff847b263602299567b723a3c718d' 
  AND token = 'Pl1bIziQjVahn3eDY2xUhS3RrZi4qLkL1oLT/9DhPd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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