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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e69f41e588f19dd33130e637ff2d053412feeb15a597853bf972475417087a' 
  AND token = 'GNhzm0V5KuTRneH4Hd8TiEY19mMP9dqNGW7h3Jrm510=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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