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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ac06d406408e98525561507d73e24bca0571de5d1b40dc6ada55852386d991' 
  AND token = 'tD5/e7kdFArbe+WZ72PsOG6R6yyCa0ZTPT92T6wX7yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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