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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2537f4feee3b873d083ba5a4b4b60ccfe2babc7db091a018e195a7f4cc7134' 
  AND token = 'QIQjU0VA/ttETQ6yQveSAISeC/Rt7S/lyPRkifjyoFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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