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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6d01de662511f580345f2abe906cda5a414e5f1549cdca8e44e8e73bc14276' 
  AND token = '75D3yTb8CnW0ayOAPdqOAdR89PU7htIZ3QC2xkGE7tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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