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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf22e1a4e527e68c69f03540f146640d7467123a115b7fd0b73de340b03ff639' 
  AND token = 'XNRksBXAklEx7o/ankqBvpDImOEkHrBFqZCYu0jermI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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