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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2b61fa13ce9c12469c979aee6f98134b13099e8dca1d32f168e299399438a8' 
  AND token = 'bUO7nRaZf8fMzpeXaM35SJGB2S1X5GeAErEq9StcGSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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