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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d264393000671a8109bb711f14846b125d321c0f9b900c46631cc4c7adad135' 
  AND token = 'BbvFenZ1luNFHccNxXEFP/p8o4IDlJSmZR41A9y+lGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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